The invention discloses equipment for injecting glue into bottle caps. The equipment structurally comprises a control machine case, an operation button, an operation panel, a base, an overflow cuttingdevice, a discharging pipe, a glue injection box, a sol box and a glue pipe. The control machine case is perpendicular to the rear end of the glue injection box. The operation button is embedded andinstalled in the outer wall of the operation panel. The equipment for injecting the glue into the bottle caps is structurally provided with the overflow cutting device, when the equipment is started and used, the bottle caps enter an armature from a material pipe, a half gear is used for rotationally driving an upper top plate to move downwards, when the upper top plate moves downwards, a cuttingtool embedded in the upper top plate trims the bottle caps, bearing columns are used for fixing the descending height of the upper top plate, and after cutting is finished, the upper top plate continuously descends, a lower contact is connected, an electromagnet is powered on through the contact, the armature is attracted, and the bottle caps above the armature fall down and are collected. By means of the device, the situation of glue overflow of the manufactured bottle caps can be reduced, and the product quality is improved.